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NEETChemistryClassification of Elements and Periodicity in Properties

Which of the following are correct? (i) First ionisation enthalpy of He < Second ionization enthalpy of Li. (ii) Li has the highest second ionisation enthalpy. (iii) All d -block elements are transition elements. (iv) The only alphabet not found in the periodic table is the letter ' J '. (v) Francium concentration is 10⁻¹⁸ ppm on Earth.

Options

  1. A(i), (ii), (iv)
  2. B(i), (ii), (iv), (v)
  3. C(i), (ii), (v)
  4. D(iv), (v)

Correct answer

B. (i), (ii), (iv), (v)

Step-by-step solution

All transition elements are d -block elements but all d -block elements are not transition metals. A transition metal is one which forms one or more stable ions which have incomplete d -orbitals. On the basis of this definition, scandium and zinc do not count as transition metal although they are d-block elements. Thus, statement (3) is incorrect.

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